Canadian five-piece vocal group Walk Off the Earth, who gained Internet fame with their YouTube cover of Gotye's 'Somebody That I Used to Know,' are back with a version of Taylor Swift's 'I Knew You Were Trouble.' Don't miss their unique a cappella spin on Taylor's track.

The video begins with Sarah Blackwood singing Swift's words as her fellow bandmates join the song one by one, providing harmonies, percussion and vocals that mimic keyboards. Despite the cover's lack of instrumentation, it sounds a lot like the original, thanks to Terry 'krNfx' Im, who provides the drum and dubstep wobble noises. In a post on their Facebook page, Walk Off the Earth wrote, "Terry 'krNfx' Im is the future of beat boxing. The guy is insane. Make sure you check him out."

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